Castledine Electronics


The Supa MkI is a replica of the prototype Supa Fuzz from 1966. The circuit has three OC75 germanium transistors and is similar to the MkI Tone Bender®. The main difference is that the fuzz is fixed at maximum and the fuzz control in the Tone Bender® (Attack) is replaced with a tone control (Filter). This is the reason for the fuzz control being mislabelled as "Filter" on the production Supa Fuzzes, which had the MkII Tone Bender® circuit.

Supa MkI Features:

  • Built with the original Supa Fuzz prototype as a reference.
  • Circuit on 0.15" pitch strip board using the same layout as the original (bar the addition of an output capacitor, which the original lacks).
  • Three germanium OC75 transistors.
  • 1% tolerance metal film resistors.